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^MANUAL
CHANGES
MODEL
1821A
TIME BASE
AND DELAY GENERATOR
Manual
Serials
Prefixed:
809-
Manual
Printed:
JUNE
1968
Make
all
changes
in this
manual
according
to
the
Errata
below.
Also check
the following table for
your
instrument
serial prefix
(3
digits)
and/or
serial
number
(8
digits)
and
make
any
listed
change(s)
in
the
manual:
Serial Prefix
or
Number
Make
Manual Changes
Serial Prefix
or
Number
Make
Manual Changes
ERRATA
Table
6-2,
Replaceable
Parts,
A3: Change
description to
A:
sweep
time
(inci
A2
and
A4).
Add
A4:
HP
Part
No. 01821-61905;
TO
1;
A: sweep time
switch.
C501: Change
to
HP
Part
No. 01 60-3355;
TO
1;
C:
fxd poly
1
uF
5%
200 vdcw
(preferred
replacement).
A
C504, C526: Change
to
HP
Part
No. 0160-3540;
TQ
2;
C:
fxd poly 0.001
uF5%
100
vdcw
(preferred
replacement).
A
C503, C525; Change
to
HP
Part
No. 0160-3541;
TQ
2;
C:
fxd poly
0.01
uF
5%
100
vdcw
(preferred
replacement).
A
C502, C524; Change
to
HP
Part
No. 0160-3542;
TQ
2;
C:
fxd poly
0.01
uF
5%
100
vdcw
(preferred
replacement).
LI 02, LI 03, LI 07, L1
10.
L201, L302, L305, L306:
Change
to
HP
Part
No. 9140-0179;
TQ
8; L;
fxd
22 uh
10%
(Preferred
Replacement).
Q412: Change
to
HP
Part
No. 5080-0482; Q:
Si
fet (selected)
(Preferred
Replacement).
MISCELLANEQUS;
HP
Part
No. 01821-01204:
Change
to Bracket: plug
(P2).
HP
Part
No.
01821-04101
:
Change
to
Plate:
mounting
(J1).
Page
8-5,
Figure
8-4,
L102, L103, L107, L1
10:
Change
value to
22
uh.
Page
8-7,
Figure
8-6,
L201
:
Change
value to
22
uh.
Page
8-9,
Figure
8-7,
L302, L305, L306:
Change
value to
22
uh.
CHANGE
1
Table
6-2,
Replaceable
Parts,
VR201,VR403:
Change
to
HP
Part
No. 1902-0688;
VR:
breakdown, 53.6V.
Page
8-7,
Figure
8-6,
Schematic,
VR201:
Change
to
53.6V.
Page
8-11, Figure
8-8,
Schematic,
VR403:
Change
to 53.6V.
Page
8-14, Figure 8-11,
J1:
Move
-1-1
5V
power from
pin 21
to
pin 20.
CHANGE
2
Table
6-2,
Replaceable
Parts,
Add
C108, C304:
HP
Part
No. 0140-0149;
TQ
2;
C:
fxd mica
470 pF
5%
300
vdcw.
Q101: Change
to
HP
Part
No. 1854-0215.
R113: Change
TQ
to
6.
R114, R305: Change
to
HP
Part
No. 0757-0442;
TQ
6;
R:
fxd
metfim
10 k
ohms 1%
1/8W,
11
December 1969
R1
40: Delete
TQ.
A
=
Latest additions to
this
change
sheet.
This change
sheet
supersedes
all
prior
change
sheets for
this
manual.
Supplement
A
for
01821-90904
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